The single most important key to success at horn or any musical endeavor (or life for that matter) is creating the time to let it happen. This concept sounds easy, but it is not so easy to execute. Making practice part of your daily routine requires commitment.
Daily (or nearly daily) practice is critical to becoming a great horn player. To accomplish anything, other things must be set aside. There will always be something else to do or take care of, so you have to prioritize practicing.
Create-and schedule- a specific time for your practice each day. It can change from day to day, but have a set practice time. Treat your scheduled practice time as if you are meeting up with a good friend. Remember, you are investing your precious time and energy into this beautiful music because you love it.
For example, a student's weekly practice schedule might look something like this:
6:00-6:30 PM Monday, Tuesday & Wednesday
5:00-5:30 PM Thursday
7:00-7:30 PM Friday (optional)
10:30-11:00 AM Saturday & Sunday
Many students set timers to remind themselves to practice. Excuse yourself from other activities, including texting and phone calls, and remind everyone that now is the time you have committed to your horn playing.
In my experience, the earlier in the day you practice, the better the practice quality. Most of us are more alert and have more energy, focus, and patience earlier in the day. When your body is relaxed you breathe better, which also improves your playing. Plus, you may be able to add a practice session later in the day if your first session is early enough! :-)